Welt shoe sewing machine



Aug. 29, 1950 o. R. HAAs WELT SHOE SEWING MACHINE 2 Sheets-Sheet '1Filed Aug. 28, 1947 1 ....J x U m,

Inventor 05230 Haas Aug. 29, 1950 o. R. HAAS WELT SHOE SEWING MACHINE 2Sheets-Sheet 2 Filed Aug. 28, 1947 Inventor Otto R Haas Patented Aug.29, 1950 UNITED STATES PATENT OFFICE WELT SHOE SEWING MACHINE Otto R.Haas, Wenham, Mass, assignor to United Shoe Machinery Corporation,Flemington, N. 3., a corporation of New Jersey Application August 28,1947, Serial No. 771,031

7 Claims. 1

The present invention relates to welt shoe sewing machines and is hereinillustrated as embodied in a curved hook needle chain stitch machinesimilar to the machine disclosed in United States Letters Patent No.2,220,112, dated November 5, 1940, upon application of Alfred R.

Morrill.

The machine of the patent is provided with a stop mechanism for bringingthe machine to rest with the stitch forming devices in a predeterminedposition to facilitate easy removal of a shoe and with welt gripping andsevering mechanism tripped into operation upon removal of a shoe fromthe stitch forming devices by a pull exerted on the welt attached to theshoe. It has been found that in some instances the tripping of the weltgripping and severing mechanism in this way subjects the operator of themachine to certain hazards, particularly if adjustments of the machineare attemped without first disconnecting the machine from its source ofpower. For instance, if an excessive pull is exerted on the welt duringadjustments, a repetition of the welt gripping and severing operationmay cause injury to the operators hands in case they hap-. pen to beengaged by the gripping and severing devices.

An object of the present invention is to provide a welt shoe sewingmachine of the type referred to having novel and improved means forpreventing injury to an operator by the welt gripping and severingmechanism if an attempt is made to adjust the machine withoutdisconnecting the machine from its source of power. Other objects are ingeneral to improve the construction and mode of operation of a welt shoesewing machine and to provide a machine which will comply in allrespects to accepted safety des.

To these ends the machine of the presen invention is equipped with theusual mechanism for gripping and severing the welt at the end of a seamand with devices for tripping said mechanism into operation upon removalof a shoe, which there are provided connections actuated by the grippingand severing mechanism after a single operation thereof to render thetripping devices inoperative again to trip the gripping and severingmechanism, the condition of inopera:

tiveness being retained until a new seam is started. In this way theoperator is safeguarded so that adjustment of the machine which mightinclude an accidental pull or tension in the welt will not causerepetition of the welt gripping and severing operation. In its preferredform the second operation preventing means acts to free the welt fromthe tripping devices after the first welt gripping and severingoperation.

As in the machine of the patent, the gripping and severing mechanism istripped into operation by movement of a welt guide having a clamp forcausing the guide to move with the welt during removal of a shoe at theend of a seam. In the illustrated form of the machine the trippreventing means disengages the clamp from the welt after a singleoperation of the clamping and severing mechanism.

lhese and other features of the invention and other novel constructions,combinations and arrangements of parts as hereinafter described andclaimed will be apparent from the fOllOWing description taken inconnection with the accompanying drawings.

Referring to the drawings;

Fig. 1 is a view in -right side elevation of so much of the head of awelt shoe sewing machine as is necessary to illustrate the features ofconstruction embodying the present invention, a part of the casinghaving been broken away to show the underlying mechanism; and

Fig. 2 is a detail sectional view in plan on an enlarged scale of theright-hand portion of the machine and certain of the inner parts asillustrated in Fig. 1. I

The machine illustrated in the drawing is intended for sewing the upperand welt to the insole of a welt shoe and is provided with a curved hookneedle 2, a curved awl 4, a needle looper G, a channel guide 8, a threadfinger I0, and other stitch forming devices more fully described inthepatent referred to. In the operation of the machine a shoe having theupper lasted to.v the insole is presented to the machine and the partsare sewed together with a welt l2 directed from a suitable source ofsupply toward the point of, operation of the stitch forming devices. Atthe end of a welt sewing operation the machine is brought to rest withthe stitch forming devices in predetermined positions to facilitateremoval of the sewn shoe. For this purpose a stop mechanism is providedincluding a vibrating bell crank l4 and a locking pin it connectedthrough a link !8 with a control lever 25 fulcrumed on a screw stud 22and actuated by a cam roll 24 through connections to a starting andstopping treadle not shown) arranged to be depressed by the operator instarting a new seam. After the machine has been brought to rest at theend of a seam, the welt is pulled when the sewn shoe-i withdrawn fromoperate,

ing position and we1t gripping and severing mechanism is tripped intooperation. The welt gripping and severing mechanism includes weltgripping jaws 26 actuated by a one revolution shaft 28 tripped intooperation through connections with a welt guide comprising a roll 30over which the welt [2 passes to cause the guide roll 30 to be movedwith the welt. The welt is gripped along that portion engaging the rollby a clamp 32 mounted on the roll and actuated as the machine comes torest, in a manner more fully set forth in the patent.

To actuate the clamp 32 into gripping engagement with the welt, the roll38 is provided with a central passage t receive a plunger 34 connectedthrough a Spring 36 (Fig. 2) with a second plunger 38 having arearwardly projecting portion engagin a pivoted arm 40. The plunger 34is actuated through the spring 36 against a, set screw 42 to swing alever 44 in which the set Screw and the clamp 32 are mounted to causethe clamp to grip the welt. For actuating the arm 46 at the end of a,seam the lever passes across the end of a sewing shaft 45 havingslidably mounted within it a stop actuated member comprising a rod 46arranged to be moved longitudinally against the arm when the machinecomes to its regular stopped position. The rod 46 is movedlongitudinally by a plate 48 pivotally mounted in the sewing shaft 45and provided with an edge engaging the inner end of the rod 48. A Secondedge of the plate 48 is engaged by a spring pressed plunger 58 actedupon by a lever 52 in a cam 54 on the sewing shaft 45 during the finalstopping movement of the machine as a cam follower 56 moves into contactwith the lever 52 to press the plunger against the force of its spring.

In the machine of the patent above identified, the connections describedprevent free movement of the welt relatively to the roll 38 when themachine is at rest and if a moderate pull is imparted to the welt,tripping devices including the roll will be actuated sufficiently tocause operation of the gripping and severing mechanism. In addition tothe roll, the tripping devices comprise a rod 58 connected with the rolland an arm 68 secured to a rock shaft 62. Movement is thereby impartedto a stop arm 64 fast on the shaft 62 to swing the stop arm away froma.latch 56 forming a part of a one revolution clutch on the shaft 28.Such movement of the stop arm away from the latch trips the clutch intooperation and causes the shaft to be rotated a single revolution.Rotation of the shaft 28 actuates an cecentric on the shaft surroundedby a strap 68 which, in turn, is connected to a gear segment 18 meshingwith one of a pair of pinions 72, the other of which meshes with a rackbar '14 for actuating the gripping jaws 28 and a welt severing knife onthe rack bar. This is the usual operation of the gripping and severingmechanism when a sewed shoe is being withdrawn from the patentedmachine. However, the same operation may be repeated after the sewedshoe is withdrawn and the welt severed. In such case, there is dangerthat the operator's hands or a portion of a completed shoe disposedaccidentally in the path of the gripping jaws and the severing knife maybe subject to injury or damage.

To prevent injury to the operator or damage to a shoe by anunintentional or accidental pull on the welt l2 in the machine of thepresent invention the welt is freed from the grip of the clamp 32 on theguide roll 38 directly after each welt gripping and severing operation.Thus, if a pull is exerted on the welt after freeing it from the grip ofthe clamp, the welt will be moved over the roll without causing arepetition of the gripping and severing operation and any suitableadjustments including repositioning of the welt end remaining in themachine may be accomplished by the operator in safety, For this purposethe stop actuated rod 48 does not operate directly against the arm 40but the arm has an opening to admit full movement of the rod 46 when themachine comes to rest without actuating the arm.

To cause the welt clamp 32 to be actuated against the welt in the usualway at the end of a seam, connections are provided between the weltgripping and severing mechanism and the tripping devices therefor. Theseconnections act on the arm 40 which has a lengthwise passage to receivea recessed slide bar 16 movable lengthwise along the arm to bring therecess in the bar into and out of alinement with the rod 46. Thus, whenthe recess in the bar 16 is moved out of alinement with the rod, the rodengages the bar, and through the bar moves the arm 48 in the usual wayto cause the welt to be gripped. When the recess in the bar is movedinto alinement with the rod, the welt is released from the grip of theclamp 32. To insure free passage of the unclamped welt bout the roll 30,the roll is surrounded with an antifriction bearing sleeve l8 over whichthe Welt rides.

To move the slide bar 16 along the arm 48 the rearward end of the barhas a threaded opening within which is received a threaded stud portionof a transversely slotted block 80. Within the slotted portion of theblock there is movably mounted pin at the upper end of a shifter lever82 secured to a shaft 84 rotatable in a bracket 86 fast on the frame ofthe machine. The lower end of the shifter lever 82 extends intoproximity with a cam 88 on the one revolution shaft 28 of the grippingand severing mechanism. The arrangement is such that in the normalstopping position of the machine a cut away portion of the cam is inalinement with the lower arm of the lever 82 so that the lever may shiftthe bar 16 to bring its recess out of alinement with the rod 46. It isthis position of the lever that enables the welt to be gripped by theclamp 32 at the end of a sewing operation. As soon as the welt grippingand severing mechanism is thrown into operation the cam 88 rocks thelever 82 to shift the bar to a position with the recess in alinementwith the rod 46, thus releasing the welt from the grip of the clamp 32.

To restore the parts to a position of readiness in starting the machinein operation the welt gripping connections are reconnected with thestopping mechanism. For this purpose an operative connection is providedbetween the control lever 28 and the bar'actuating lever 82 to move thelower end of the lever'into the recess of the cam 88. These connectionsinclude a pin 98 located in a position to be engaged by the controllever 28 and mounted on an arm 92 secured to the shaft 84. 'When thecontrol lever 20 is actuated to render the stop mechanism inoperativebefore the machine is started in operation upon a new shoe, the leverengages the pin 90 and rocks the bar shifting lever 82 in the desiredmanner.

The nature and scope of the invention having been indicated and aparticular embodiment having been described, what is claimed is:

1. A welt shoe sewing machine having stitch forming devices including acurved hook needle, mechanism for gripping and severing the welt at theend of a seam, and devices for tripping said mechanism, in combinationwith connections actuated by the gripping and severing mechanism after asingle operation. thereof to render said tripping devices inoperative totrip the gripping and severing mechanism until a new seam is started.

2. A welt shoe sewing machine having stitch forming devices including acurved hook needle, mechanism for gripping and severing the welt at theend of a seam and devices engaged and actuated bya pull on the weltattached to a shoe to trip the gripping and severing mechanism duringremoval of a shoe at the end of a sewing operation, in combination withconnections between the gripping and severing mechanism and the trippingdevices for freeing the welt from the tripping devices to prevent arepetition of the operation of said mechanism until a new seam isstarted.

3. A welt shoe sewing machine having stitch forming devices including acurved hook needle,

mechanism for gripping and severing the welt,

a welt guide, and a clamp acting on the welt along that portion engagingthe guide to cause movement of the guide with the welt during movementof a sewn shoe at the end of a sewing operation to trip the gripping andsevering mechanism, in combination with connections between the grippingand severing mechanism and the tripping clamp for disengaging the clampfrom the welt during the single operation of the grippin and severingmechanism to prevent a repetition of the operation of said mechanismbefore starting a new seam.

4. A welt shoe sewing machine having stitch forming devices, including acurved hook needle, mechanism for gripping and severing the welt at theend of a seam, a welt guide roll connected to trip the gripping andsevering mechanism when rotated, a clamp acting to grip the welt on theguide roll to cause rotation of the guide roll during removal of a shoeat the end of a sewing operation, and a member actuated by movement ofthe machine into stopping position, in combination with connectionsbetween said stop actuated member and clamp to actuate the clamp intogripping relation with the welt, including a shiftable bar arranged foractuation by the gripping and severing mechanism for disconnecting theconnections between the stop actuated member and the clamp after thewelt is severed.

5. A welt shoe sewing machine having stitch forming devices, including acurved hook needle, stop mechanism for bringing the machine to rest in apredetermined position at the end of a seam, mechanism for gripping andsevering the welt when the machine is brought to rest, a welt guide, aclamp acting on the welt along that portion engaging the guide to causemovement of the guide with the welt to trip the gripping and severingmechanism during removal of a shoe at the end of a sewing operation, anda member actuated by movement of the machine into stopping position, incombination with connections between said stop actuated member and clampto cause the clamp to grip the welt against the guide, including ashiftable bar arranged for actuation by the gripping and severingmechanism for disconnecting the connections between the stop actuatedmember and the clamp and a connection between the stopping mechanism andthe disconnecting bar for shifting the bar to reconnect the welt rippingconnections when the stop mechanism is rendered inoperative in startingthe machine in operation on a new shoe.

6. A welt shoe sewing machine having stitch forming devices including acurved hook needle, stop mechanism for bringing the machine to rest in apredetermined position including a control lever, mechanism for grippingand severing the welt when the machine is at rest, a welt guide roll, aclamp acting on the welt along that portion engaging the guide roll tocause movement of the roll with the welt to trip the gripping andsevering mechanism during removal of a shoe at the end of a seam, and amember actuated by a movement of the machine into stopped position, incombination with connections between said stop actuated member and clampcomprising an arm and a recessed bar on the arm arranged for shiftingmovement to bring its recessed portion into the path of said stopactuated member to prevent operation of the clamp, and a connectionbetween the bar and the control lever to shift the bar to a positionwith its recessed portion out of alinement with said step actuatedmember when the stop mechanism is rendered inoperative in starting themachine in operation on a new shoe.

7. A Welt shoe sewing machine having stitch forming devices including acurved hook needle,

- stop mechanism for bringing the machine to rest including a controllever actuable by the operator to render the stop mechanism inoperativein starting the machine in operation on a new shoe, mechanism forgripping and severing the welt when the machine is at rest including aone revolution shaft, a welt guide roll, and a clamp acting on the weltalong that portion engaging the guide roll to cause movement of the rollwith the welt to trip the one revolution shaft during removal of a shoeat the end of a seam, and a member actuated by a movement of the machineinto stopped position, in combination with connections between said stopactuated member and the clamp comprising an arm and a recessed bararranged on the arm for lengthwise sliding movement toward and from aposition with the recess in the bar in alinement with said stop actuatedmember to prevent operation of the welt clamp, a shifter lever for therecessed bar, and a cam on the one revolution shaft acting on theshifter lever to bring the recess in the bar into alinement with saidstop actuated member, and an operative connection between the shifterlever for the recessed bar and the stop mechanism control lever to shiftthe bar to a position with its recessed portion out of alinement withsaid stop actuated member when the control lever is actuated at thebeginning of a new seam.

OTTO R. I-IAAS.

REFERENCES CITED The following references are of record in the file ofthis patent:

UNITED STATES PATENTS Number Name Date 1,411,798 Meyer Apr. 4, 19221,951,369 Oliver Mar. 20, 1934

